UIView – How to get notified when the view is loaded?

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Depending on what kind of actions you need to perform, there are several techniques:

  1. -(id)initWithFrame:(CGRect)frame – UIView’s designated
    initializer; always sent to a UIView to initialize it, unless the
    view is loaded from a nib;
  2. -(id)initWithCoder:(NSCoder *)coder – always sent to initialize a UIView whenever the view is loaded from a nib;
  3. -(void)awakeFromNib – sent after all the objects in the nib are initialized and connected; applicable only if you load the object from a nib; you must call super;
  4. -(void)willMoveToSuperview:(UIView *)newSuperview – sent immediately before the view is added as a subview to another view; newSuperview may be nil when you remove the view from its superview;
  5. -(void)willMoveToWindow:(UIWindow *)newWindow – sent immediately before the view (or its superview) is added to a window; newWindow may be nil when you remove the view from a window;
  6. -(void)didMoveToSuperview – sent immediately after the view is inserted into a view hierarchy;
  7. -(void)didMoveToWindow – sent immediately after the view gets its window property set. –

Basically, you can choose to perform your actions during initialization (1 & 2), after loading from a nib (3), before insertion into a view hierarchy (4 & 5) and after that (6 & 7).

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